Augustin Alfred Joseph Paul-Boncour (4 August 1873 - 28 March 1972) was a French politician of the Third Republic.
Turning to Socialism, he joined the SFIO in 1916, but resigned in 1931 to found the independent group Union Socialiste Républicaine, which soon merged with the Parti Démocratique Républicain to form the Parti Démocratique Républicain et Social (PDRS). Also in 1931, Paul-Boncour was elected to the Senate, and served in that capacity until the establishment of the Vichy régime in 1940 (during World War II).
During his time as a Senator, Paul-Boncour served in a variety of cabinent and diplomatic posts. He was the Permanent Delegate to the League of Nations from 1932 to 1936, Minister of War in 1932, Premier from December 1932 to January 1933, and Foreign Minister on three separate occasions (December 1932 to January 1934, January to June 1936, and March 1938).
Paul-Boncour was opposed to the formation of the Vichy government, and recommended continuing the fight against Nazi Germany after the fall of France, from Algiers. As a member of the Consultative Assembly from 1944, he led the French delegation to the United Nations conference in San Francisco and signed the United Nations Charter on behalf of France. He once again served as a senator from 1946 to 1948.
He died in Paris.